inStreamAssetUploadRequest.setInStreamAsset(inStreamVideoAsset);
inStreamAssetUploadRequest.setCreativeId(creativeId);
// Save the media file.
InStreamVideoCreative inStreamVideoCreative =
creativeService.uploadInStreamAsset(inStreamAssetUploadRequest);
// Display a success message.
System.out.printf("Added a media file to In-Stream video creative with ID \"%s\".%n",
inStreamVideoCreative.getId());
}